I notice that the Oracle installation page [1] for JDK 11 says that macOS 10.11 is required. (The OpenJDK release page [2] says nothing.) The code itself is built for macOS 10.9. Why the difference? Alan [1] https://docs.oracle.com/en/java/javase/11/install/overview-jdk-installation.html [2] http://jdk.java.net/11/